Description: M-Tree (P. Ciaccia VLDB 1997) VA-File (R. Weber VLDB 1998) Pyramid-Tree (S. Berchtold SIGMOD 1998) hybrid-Tree (K. Chakrabarti ICDE 1999) A-Tree (Y. Sakurai VLDB 2000) IQ-Tree (S. Berchtold ICDE 2000)
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